The painting is great... she seems desperate due to failing in the battlefield, but she doesn't really transmit the will of suicide. Maybe a more frontal point of view would work better, with her showing the stomach, making more obvious her final act.
Great work with the colors and shadings

Woo! Awsome, very awsome. I love the expression upon her face, and the colouring is VERY good. I like her armour too... Her pose, I could never be able to do, and the darkness is great. I like the way you drew her hands... Well done. ^_^